Hose end couplings

ABSTRACT

A hose end coupling of the kind comprising a tubular nipple or insert piece which is forced into the interior of the hose and is formed with exterior circumferential ribs to grip the interior wall of the hose and an internally circumferentially ribbed ferrule which is swaged over the tube to compress the hose wall between the ferrule and the insert, an inwardly extending lip on the ferrule engaging in a groove in the insert beyond the end of the hose. Wherein the ribs of the ferrule are in two sets separated by a groove which is wider and deeper than the space between any pair of adjacent ribs, the ribs of the set nearer the outer end of the ferrule having a smaller internal diameter than the majority of the ribs of the innermost set of which the rib adjacent the groove has an internal diameter substantially equal to that of the ribs of the outer-set.

United States Patent 1 1 Evans 111 3,711,131 1 51 Jan. 16,1973

[54] HOSE END COUPLINGS [75] Inventor:

g a d Assignee: Flextube Limited, London, England Filed: Feb. 17, 1971 Appl. No.: 116,004

[30] Foreign Application Priority Data Feb. 25, 1970 Great Britain ..9,150/70 US. Cl ..285/256, 285/259 Int. Cl "F161 33/00 Field of Search "285/256, 254, 149, 257

References Cited UNITED STATES PATENTS FOREIGN PATENTS OR APPLICATIONS 138,557 9/1950 Australia. ..285/256 10/1967 New 7/1949 Burckle et al. ..285/149 28 26 24 ZlU 7Q Harry James Evans, London, Env v 1,136,935 l/l957 France ..285/259 Primary Examiner-Dave W. Arola Attorney-Dowell & Dowell [5 7] ABSTRACT A hose end coupling of the kind comprising a tubular nipple or insert piece which is forced into the interior of the hose and is formed with exterior circumferential ribs to grip the interior wall of the hose and an internally circumferentially ribbed ferrule which isswaged over the tube to compress the hose wall between the fei'rule and the insert, an inwardly extending lip on the ferrule engaging in a groove in the insert beyond the end of the hose. Wherein the ribs of the ferrule are. in

two sets separated by a groove which is wider and deeper than the space between any pair of adjacent ribs, the ribs of the set nearer the outer end of the ferrule having a smaller internal diameter than the majority of the ribs of the innermost set of which the rib adjacent the groove has an internal diameter substantially equal to that of the ribs of the outer-set.

1 Claim, 1 Drawing Figure PATENTEDJAHIBIEWS 3.711.131

I?! Inventor uoss END COUPLINGS This invention relates to hose end couplings.

In a conventional form such couplings comprise a tubular nipple or insert piece which is forced into the interior of the hose and is formed with exterior circumferential ribs to grip the interior wall of the hose and an internally circumferentially ribbed ferrule which is swaged over the tube to compress the hose wall between the ferrule and the insert, an inwardly extending lip on the ferrule engaging in a groove in the insert beyond the end of the hose. Such a coupling will hereafter be referred to as a swaged hose end coupling.

The ferrule of a swaged hose end fitting in accordance with the invention is formed internally with two sets of inwardly facing circumferential ribs separated by a groove which is wider and deeper than the space between any pair of adjacent ribs, the ribs of the set nearer the outer end of the ferrule having a smaller internal diameter than the majority of the ribs of the innermost set of which the rib adjacent the groove has an internal diameter substantially equal to that of the ribs of the outer-set. v

I The groove acts to aid the retention of the ferrule on the hose due to the fact that the compression of the hose caused by the swaging of the ferrule, forces the wire reinforcement of the hoseoutwardly into the annular groove between the two sets of ribs. The fact that the outer set of ribs have a smaller'internal diameter enables them to create high hose compression areas and the relatively larger internal diameter of the ferrule over the region of the majority of the second set or ribs, creates slightly reduced hose compression in these areasof the hose where sealing is to be effected but where the hose liner must not be fractured if a high pressure seal is to be maintained.

7 As the rib of the inner set adjacent the groove has an internal diameter substantially equal to that of the ribs of the outer set the groove is effectively deepened and greater outward deformation of the wire reinforcement of the hose is achieved whilst maintaining the relatively lower compression in the fluid seal areas opposite to the second setof ribs. 1 a a An embodiment of a hose end coupling in accordance with the invention is shown in the accompanying sketch drawing which is a halfcross-section spaced as well as deeper than the ribs 12, are forced into the surface of the hose and cause the wire reinforcement generally indicated at 16 to deform into a roove 18 formed between the two sets of teeth. As the oremost rib 14 of the second set of llbS pro ects inwardly to the same extent as the second set of ribs the groove 18 is deeper than if the first rib 14 was the same height as ribs 12 and the wire reinforcement is caused to be deformed upwardly into the groove somewhat as illustrated to aid gripping of the coupling on the hose when subjected to high pressure.

The relatively shallow ribs 12 act to form a seal, with slightly reduced compression of the hose, in the area where sealing has to be effected but where the hose liner must not be fractured. v I

'ln accordance with conventional practice the outer end ofthe ferrule is formed with an inward lip 20 which is swaged into a corresponding groove 22 on-the surface of the nipple or insert piece so that proper connection between the'nipple and ferrule is achieved.

Also typical of conventional practice the outer end of the nipple or outer insertpiece is provided with a groove 24 receiving a wire circlip 26 to hold a coupling nut 28 onto the nipple whilst allowing it to rotate relatively to the nipple.

I claim:

1. In a hose having an outer casing, a wire reinforcement anda bore therein, an end fitting comprising:

a tubular nipple inserted in the said bore at an end'of the hose; 1

. a coupling nut rotatably retained on the nipple; and

a swaged ferrule having an outer end adjacent said nut and an inner end remoted from said nut, and formed internally with two sets of inwardly facing hose engaging circumferentialribs both of which sets engage said outer casing, the sets of ribs being 

1. In a hose having an outer casing, a wire reinforcement and a bore therein, an end fitting comprising: a tubular nipple inserted in the said bore at an end of the hose; a coupling nut rotatably retained on the nipple; and a swaged ferrule having an outer end adjacent said nut and an inner end remoted from said nut, and formed internally with two sets of inwardly facing hose engaging circumferential ribs both of which sets engage said outer casing, the sets of ribs being separated by a groove which is wider and deeper than the space between any pair of adjacent ribs, the ribs of the set nearer the outer end of the ferrule having a smaller internal diameter than the majority of the innermost set and being broader and being more widely spaced than the ribs of the innermost set, the rib of the innermost set adjacent the groove having an internal diameter substantially equal to that of the outer set. 